CN113193757A - Three-port DC-DC converter topological structure and control method thereof - Google Patents
Three-port DC-DC converter topological structure and control method thereof Download PDFInfo
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- CN113193757A CN113193757A CN202110460996.4A CN202110460996A CN113193757A CN 113193757 A CN113193757 A CN 113193757A CN 202110460996 A CN202110460996 A CN 202110460996A CN 113193757 A CN113193757 A CN 113193757A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a three-port DC-DC converter topological structure and a control method thereof, wherein the three-port DC-DC converter topological structure comprises: one input port, two output ports; the input port structure is an MMC circuit and is used for bearing high voltage of a medium-voltage direct-current power grid; the MMC circuit comprises two phases, each phase consists of an upper bridge arm and a lower bridge arm, each bridge arm comprises n sub-modules with the same structure, and each sub-module adopts a half-bridge type sub-module topological structure; the two output ports are structurally DAB circuits and comprise a first low-voltage side DC/AC full bridge circuit and a second low-voltage side DC/AC full bridge circuit; wherein the input port and the output port are connected by an isolation transformer. The three-port DC-DC converter topological structure can realize energy transmission from an MVDC side to an LVDC side; the voltage change rate can be reduced, the impact of instantaneous voltage on the switch can be reduced, and stable power transmission can be realized; and the circulation current of each phase is reduced, and the power loss is reduced.
Description
Technical Field
The invention belongs to the technical field of topology and control of medium and low voltage DC-DC converters, and particularly relates to a three-port DC-DC converter topology structure and a control method thereof.
Background
The non-isolated multi-port DC-DC converter is paid much attention due to the characteristics of high working reliability, convenient use and the like, is originated from a basic booster circuit, can be expanded to a multi-module structure, but is limited by the size and direction of transmission power, and the topology can only be used under the condition of low voltage. Some researchers have introduced High Frequency Transformers (HFTs) to establish electrical isolation between the primary and secondary sides; admittedly, high frequency transactions increase power density, enable bidirectional transmission of power, and overcome some of the disadvantages of non-isolated circuits.
According to the characteristics of different ports, isolated multi-port DC-DC topologies have various types; the method comprises the steps that a modular multilevel converter is selected as an input in consideration of voltage levels, and energy transmission from a medium-voltage direct current (MVDC) side to a low-voltage direct current (LVDC) side is achieved; since there are numerous sub-modules, it is necessary to consider the complexity and efficiency of the control, and the insertion and bypassing of sub-modules can result in large voltage change rates and large power losses.
In summary, a novel three-port DC-DC converter topology and a control method thereof are needed.
Disclosure of Invention
The present invention is directed to a three-port DC-DC converter topology and a control method thereof, which solve one or more of the above-mentioned problems. The three-port DC-DC converter topological structure can realize energy transmission from an MVDC side to an LVDC side; the voltage change rate can be reduced, the impact of instantaneous voltage on the switch can be reduced, and stable power transmission can be realized; and the circulation current of each phase is reduced, and the power loss is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a three-port DC-DC converter topological structure, which comprises: one input port, two output ports;
the input port structure is an MMC circuit and is used for bearing high voltage of a medium-voltage direct-current power grid; the MMC circuit comprises two phases, each phase consists of an upper bridge arm and a lower bridge arm, each bridge arm comprises n sub-modules with the same structure, and each sub-module adopts a half-bridge type sub-module topological structure;
the two output ports are structurally DAB circuits and comprise a first low-voltage side DC/AC full bridge circuit and a second low-voltage side DC/AC full bridge circuit;
wherein the input port and the output port are connected by an isolation transformer.
The MMC circuit is further improved in that each bridge arm in the MMC circuit is connected with an inductor.
The invention is further improved in that each submodule in each bridge arm is connected in parallel with a direct-current energy storage capacitor.
The invention further improves the method and also comprises the following steps:
inductor L1The MMC circuit is used for connecting the MMC circuit with a primary side winding of the high-frequency transformer;
inductor L2The first low-voltage side DC/AC full-bridge circuit is connected with a first winding on the secondary side of the high-frequency transformer;
inductor L3And the second low-voltage side DC/AC full-bridge circuit is used for connecting the second low-voltage side DC/AC full-bridge circuit with a second winding on the secondary side of the high-frequency transformer.
The invention is further improved in that the switching devices in the MMC circuit and the DAB circuit are both IGBTs.
The invention discloses a control method of a three-port DC-DC converter topological structure, which comprises the following steps:
the primary side adopts carrier phase shift pulse width modulation to generate a five-level voltage waveform;
phase difference exists between the secondary side voltage and the primary side voltage, the phase difference between the two DAB output voltages on the secondary side and the primary side voltage is kept consistent, and power transmission is realized by adjusting the phase between the primary side voltage and the secondary side voltage;
the input port is a primary side, and the output port is a secondary side.
The invention further improves the method and also comprises the following steps: the pressure equalizing control is adopted as the outer ring control, and the circulation restraining control is adopted as the control strategy of the inner ring control.
The further improvement of the invention is that the step of adopting voltage-sharing control as outer ring control and circulating current restraining control as a control strategy of inner ring control to reduce circulating current specifically comprises the following steps:
Compared with the prior art, the invention has the following beneficial effects:
in the topological structure of the three-port DC-DC converter, an input port is of an MMC structure, and an output port is of an H-bridge structure; for the MMC side, five-level voltage waveform can be generated at the primary side through improved CPS-PWM modulation, the voltage change rate is reduced, the impact of instantaneous voltage on a switch is reduced, and stable power transmission is realized; the whole topological structure adopts single-phase shift modulation to control power flow among different ports.
The control scheme provided by the invention selects the capacitance voltage as a reference value for generating the circulating current of the outer ring and selects the circulating current as the inner ring, so that the power loss caused by the circulating current can be effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural diagram of a three-port DC-DC converter topology according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a five-level voltage waveform generated on the primary side according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a square wave voltage waveform generated at the secondary side according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for controlling a three-port DC-DC converter topology according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the circulation current of each phase before the suppression of the commutation in the embodiment of the invention;
fig. 6 is a schematic diagram of the suppression of the circulation of each phase after commutation in the embodiment of the invention.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
Referring to fig. 1, a three-port DC-DC converter topology according to an embodiment of the present invention includes 3 ports, an input port, and two output ports; wherein, input port structure is MMC, can bear the high voltage of MVDC electric wire netting. The primary side has A, B two phases, each phase is composed of an upper bridge arm and a lower bridge arm, each bridge arm comprises 4 sub-modules with the same structure, and each sub-module adopts a topological structure of a half-bridge type sub-module. The input end and the output end are connected by a high-frequency isolation transformer. The two output ports are in DAB topology and are respectively connected with a resistor R1、R2。
Each bridge arm in the medium-voltage side MMC topology is connected with an inductor to inhibit dynamic oscillation of bridge arm current, and each bridge arm in each bridge armAnd the sub-modules are all connected with a direct current energy storage capacitor in parallel. Inductor L1The MMC circuit is used for connecting the MMC circuit with a primary side winding of the high-frequency transformer; inductor L2The first low-voltage side DC/AC full-bridge circuit is connected with a first winding on the secondary side of the high-frequency transformer; inductor L3And the second low-voltage side DC/AC full-bridge circuit is used for connecting the second low-voltage side DC/AC full-bridge circuit with a second winding on the secondary side of the high-frequency transformer.
As shown in fig. 2, the topology generates a five level voltage on the primary side.
As shown in fig. 3, the phase difference of the five-level voltage of the MMC and the square voltage of two different DAB ports is maintained in agreement. Subsequently, no power exchange takes place between the two DAB output ports. Meanwhile, the H-bridge has no internal phase-shift duty ratio, so the alternating current equivalent voltages of the two H-bridges are square wave voltage waveforms.
As shown in fig. 4, the control scheme of the present invention is a corresponding control scheme, which includes voltage-sharing control and circulation suppression control, where the voltage-sharing control is used as the outer-loop control, and the circulation suppression control is used as the outer-loop control, in order to reduce the circulation, because the circulation will cause a large power loss. The control scheme includes the steps of:
In the embodiment of the invention, the system simulation parameters are set in MATLAB: input voltage 3300V, output voltage all are 200V, and each bridge arm of this topology primary side MMC structure all has 4 submodule pieces, and the load on two generating lines is 200 omega, and three-winding transformer transformation ratio is 1: 1: 1.
in a simulation experiment of an embodiment of the present invention, the control scheme shown in fig. 4 is employed at the primary side.
The simulation results are shown in fig. 5 and 6. The left graph of fig. 5 is a time-varying curve of the phase A circulation before the circulation is restrained, and the right graph of fig. 5 is a time-varying curve of the phase B circulation before the circulation is restrained. The left graph of fig. 6 is a time-varying curve of the a-phase circulation after the circulation is suppressed, and the right graph of fig. 6 is a time-varying curve of the B-phase circulation after the circulation is suppressed. Comparing the left graphs of fig. 5 and 6, it was found that the a-phase circulation maximum was reduced from 50 to 0.05 after circulation suppression. Comparing fig. 5 with the right graph of fig. 6, it was found that the B-phase circulation maximum value decreased from 50 to 0.05 after circulation suppression. Therefore, by adopting the control method, the circulation of each group can be effectively reduced, the power loss is reduced, and the effectiveness and the correctness of the control method are verified.
In summary, the novel topology structure of the three-port DC-DC converter based on the improved carrier phase shift control according to the embodiment of the present invention is composed of a modular multilevel converter on the primary side and a double H-bridge on the secondary side. The primary side has two phases, each phase is composed of an upper bridge arm and a lower bridge arm, each bridge arm comprises n sub-modules with the same structure, and each sub-module adopts a topological structure of a half-bridge type sub-module. The input end and the output end are connected by a high-frequency isolation transformer. The two output port structures are DAB topologies, which are defined as H1 bridge and H2 bridge, respectively. On the basis of carrier phase shift modulation, a five-level waveform is generated on the primary side to reduce the impact of instantaneous voltage on a switch and realize stable power transmission. The control scheme comprises voltage-sharing control and circulating current suppression control, capacitor voltage is selected as a reference value of circulating current generated by an outer ring, and circulating current is selected as an inner ring, so that the power loss caused by the circulating current can be effectively reduced.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (8)
1. A three-port DC-DC converter topology, comprising: one input port, two output ports;
the input port structure is an MMC circuit and is used for bearing high voltage of a medium-voltage direct-current power grid; the MMC circuit comprises two phases, each phase consists of an upper bridge arm and a lower bridge arm, each bridge arm comprises n sub-modules with the same structure, and each sub-module adopts a half-bridge type sub-module topological structure;
the two output ports are structurally DAB circuits and comprise a first low-voltage side DC/AC full bridge circuit and a second low-voltage side DC/AC full bridge circuit;
wherein the input port and the output port are connected by an isolation transformer.
2. The topology of claim 1, wherein an inductor is connected to each leg of said MMC circuit.
3. The topology of claim 1, wherein each submodule in each leg is connected in parallel with a DC storage capacitor.
4. The three-port DC-DC converter topology of claim 1, further comprising:
inductor L1The MMC circuit is used for connecting the MMC circuit with a primary side winding of the high-frequency transformer;
inductor L2The first low-voltage side DC/AC full-bridge circuit is connected with a first winding on the secondary side of the high-frequency transformer;
inductor L3And the second low-voltage side DC/AC full-bridge circuit is used for connecting the second low-voltage side DC/AC full-bridge circuit with a second winding on the secondary side of the high-frequency transformer.
5. The topology of claim 1, wherein the switching devices of the MMC circuit and the DAB circuit are IGBTs.
6. A method of controlling the topology of a three-port DC-DC converter according to claim 1, comprising the steps of:
the primary side adopts carrier phase shift pulse width modulation to generate a five-level voltage waveform;
phase difference exists between the secondary side voltage and the primary side voltage, the phase difference between the two DAB output voltages on the secondary side and the primary side voltage is kept consistent, and power transmission is realized by adjusting the phase between the primary side voltage and the secondary side voltage;
the input port is a primary side, and the output port is a secondary side.
7. The method of claim 6, further comprising: the pressure equalizing control is adopted as the outer ring control, and the circulation restraining control is adopted as the control strategy of the inner ring control.
8. The method according to claim 7, wherein the step of reducing the circulating current by using voltage-sharing control as an outer loop control and circulating current suppression control as a control strategy of an inner loop control comprises:
in step 1, the two phases on the primary side arePhase A and phase B; collecting the current of each bridge arm at the primary side, and the current i of the upper bridge arm at the A phaseupper-aAnd phase A lower bridge arm current ilower-aHalf of the sum is A phase circulation icir-a(ii) a B phase upper bridge arm current iupper-bAnd B phase lower bridge arm current ilower-bHalf of the sum is B-phase circulating current icir-b；
Step 2, collecting primary side A-phase and B-phase capacitance voltage Vcsmi-A、Vcsmi-B(ii) a A phase capacitance voltage Vcsmi-AAnd a reference capacitor voltage VCi *Differencing as input to the outer loop PI regulator, output icir-A *Is a reference circulating current; the B-phase capacitance voltage Vcsmi-BAnd a reference capacitor voltage VCi *Differencing as input to the outer loop PI regulator, output icir-B *Is a reference circulating current;
step 3, referring A phase to a circulation current icir-A *And a circulation flow icir-aMaking a difference as an input of an inner loop PI regulator; referring phase B to circulate icir-B *And a circulation flow icir-bMaking a difference as an input of an inner loop PI regulator; the outputs of the two inner-loop PI regulators are added and then divided by 2N to obtain a reference capacitor voltage VCi *。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113726180A (en) * | 2021-09-06 | 2021-11-30 | 河北工业大学 | Output voltage self-balancing control method for bipolar direct-current power grid |
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